JPS63268926A - Intake controller for engine equipped with supercharger - Google Patents

Abstract

PURPOSE:To improve the charging efficiency by forming a communication part between a supercharge port and a natural intake passage and putting the communication part into opened state for a prescribed time before the opening of the supercharge port. CONSTITUTION:A communication part 27 is formed between a supercharge port 15 and a natural intake passage 11b, and an opening/closing valve 28 is installed in the communication part 27. The opening/closing valve 28 is opened for a prescribed time before the opening time of a timing valve 26 installed into the supercharge port 15. In this way, the residual pressure stored in the passage between the timing valve 26 and the supercharge port 5 is discharged into the natural intake passage 11b, and the blow back of the intake at the start of natural intake is suppressed, and the charging efficiency can be improved.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an intake control device for a so-called partially supercharged supercharged engine having a natural intake passage and a supercharging passage provided with a supercharging membrane. It is something that will take place.

(Prior Art) Conventionally, as shown in, for example, Japanese Patent Laid-Open No. 61-43526S, an engine intake passage has been provided with a natural intake passage (main intake passage) and a supercharging passage (auxiliary intake passage) equipped with a supercharger.
A natural intake port (main intake port) leading to the natural intake passage and a supercharging port (auxiliary intake port) leading to the supercharging passage are opened to the combustion chamber of the engine, and a supercharging passage downstream of the supercharger is provided. A partial supercharging type engine intake system is known in which a timing valve is provided in the engine so that supercharged air is supplied to the combustion chamber in addition to naturally aspirated air. In the intake system of this scale, the natural intake port and the supercharging port are opened and closed by intake valves for natural intake and supercharging in the case of a reciprocating engine, and by the rotor in the case of a rotary piston engine, The supercharging port closes later than the naturally aspirated port, while the timing valve operates in synchronization with the engine and closes from near the end of the naturally aspirated stroke (open period of the naturally aspirated port). The supercharger is supplied to the combustion chamber from the supercharging port by checking the supercharging passage for a predetermined period of time.

By the way, in such an intake device, when the timing valve and the supercharging port are closed after supercharging air is supplied, a relatively high residual pressure is stored in the passage between the timing valve and the supercharging port. becomes. Then, when the natural intake port and the supercharging port are opened, the residual pressure acts from the supercharging port through the combustion chamber to the natural intake port, causing intake air to blow back, resulting in a smooth flow. The problem remained that the inflow of naturally aspirated air was obstructed, which was disadvantageous to improving filling efficiency.

(Object of the Invention) In view of the above circumstances, the present invention provides a supercharging system that prevents intake air from blowing back due to residual pressure in the passage between the timing valve and the supercharging port and improves charging efficiency. This provides an air intake control T11 device for a one-engine machine.

(Structure of the Invention) The present invention provides an intake passage of an engine with a natural intake passage and a supercharging passage equipped with a supercharger, and a natural intake port communicating with the natural intake passage and a supercharging passage communicating with the supercharging passage. A supercharging port is opened into the combustion chamber of the engine, and a supercharging passage downstream of the supercharger is opened for a period of time from around the end of the natural intake stroke to allow supercharging air to flow into the supercharging port. In a supercharged engine equipped with a timing valve that supplies more fuel to the combustion chamber, the communication part that communicates the supercharging port with the natural intake passage, and the communication part that is kept open for a predetermined period before the supercharging port opening timing. The communication section opening/closing means is provided.

With this configuration, the residual pressure in the passage between the timing valve and the supercharging port is released to the natural intake passage just when the supercharging port is opened.

(Example) FIG. 1 shows an example of the present invention. The engine shown in this figure is a rotary piston engine, and a casing 1 of the engine body is composed of a rotor housing 2 having a trochoidal inner peripheral surface and side housings 3 located on both sides of the rotor housing 2. A substantially triangular rotor 5 is provided which is attached to the eccentric shaft 4 and rotates planetarily. The rotor 5 and the inner surface of the casing 1 define three working chambers 6 corresponding to combustion chambers. The casing 1 also includes a natural intake port 14 and a supercharging port 15, which will be described later, and an exhaust passage 7.
An exhaust port 8 communicating with the engine is provided, and a spark plug (not shown) is also provided. As the rotor 5 rotates, intake, compression, explosion, expansion, and exhaust strokes are performed in sequence.

The intake passage 10 of one engine is provided with a natural intake passage 11 and a supercharging passage 12 that includes a supercharger 13, and a natural intake port 14 communicating with the natural intake passage 11 and a supercharging passage 12 connected to the The communicating supercharging ports 15 each have a predetermined 40
It is formed in the side housing 3 of the engine body so as to open into the working chamber 6 at the position. In the figure, the natural intake passage 11 is roughly divided into the following passages and the secondary passages 1.
It is divided into 18 degrees 11b, and these passages 11a.

11b, a pair of natural intake ports 14 (- are not shown) provided at corresponding locations on both side housings 3.
is understood. The opening positions of the natural intake port 14 and the supercharging port 15 are set so that they are opened and closed by the rotor 5 at opening and closing timings shown in FIG. 3, which will be described later.

The natural intake passage 11 is provided with downstream and secondary throttle valves 16a and 16b, and is also equipped with a fuel injection valve 17. In addition, the natural intake passage 11
The supercharging passages 12 are gathered together on the upstream side, and an air cleaner 18 and an air flow meter 19 are provided in the intake passage 10 upstream of the gathering portion.

The filtration feed 11113 in the supercharging passage 12 is composed of a mechanical air pump, and the power is 8M transmitted by the engine output shaft.
4 (not shown).

The supercharging passage 12 also includes an intercooler 21 that cools the supercharging air, a relief passage 22 and a relief valve 23 that relieve excess supercharging air, and a supercharging control valve 24 that adjusts the amount of supercharging air according to the engine load. , surge tank 2
5 and the like, and a timing valve 26 is provided downstream from these. This timing valve 26 is composed of a rotary valve, and rotates in conjunction with the engine output shaft, so that it rotates in synchronization with the engine rotation and listens to the supercharging passage 12 for a predetermined period from around the end of the natural intake stroke. ing.

Furthermore, the intake system has a structure that is a feature of the present invention, including a communication section 27 that communicates the supercharging port 15 with the natural intake passage 11, and a communication section 27 that communicates the supercharging port 15 with the natural intake passage 11, and the communication part 27 that communicates the supercharging port 15 with the natural intake passage 11 for a predetermined period before the timing valve 26 opens the supercharging passage. In this embodiment, the timing valve 26 has the communication section opening/closing means built into the timing valve 26, and the communication section 27 communicating with the natural intake passage 11 is connected to the timing valve 2.
6. 28 is the communication part 2 depending on the operating condition.
This is a valve that adjusts the opening degree of 7.

FIG. 2 shows a specific example of the structure of the timing valve 26, the communication section 27, etc. incorporating the above communication section opening/closing means. In this figure, the timing valve 26 includes a valve body 31 manufactured by the same company, which is driven by the engine output shaft and rotates.
It is provided with a valve case 32 that accommodates this. The valve case 32 has, on its inlet side, a pair of left and right openings 33.34 communicating with the supercharging passage 12 upstream of the timing valve 26, and a communication section 27 located between these openings 33.34. On the outlet side, two openings 36, 37 are provided which communicate with each of the supercharging ports 15 of the two cylinders. Further, the valve body 31 is provided with two sets of passage portions 38.39 for communicating and blocking the inlet side openings 33.34 and 35 with respect to the outlet side openings 36.37, respectively. The passage portions 38 and 39 each have two rows of opening holes 38a, 38b and 39 that are inclined at a constant angle with respect to the diametrical direction.
It is composed of a and 39b.

For example, at the location where the passage portion 34 on the left in this figure is formed, in the state shown by the solid line in this figure, the frontage portion 33 of the upstream supercharging passage 12 is closed, and the opening of the communication portion 27 is closed. 35 communicates with the outlet port 36 via the through hole 38a, and when the valve body 31 is in the reversed state shown by the two-dot chain line, the opening 33 of the upstream supercharging passage 12 is connected to the i through hole. In addition, the opening 35 of the communication portion 27 is closed when it communicates with the opening 36 on the outlet side via 38a and 38b.

Further, when the passage portion 38 is displaced from the frontage portions 33, 35.36 in the circumferential direction, both the entrance side openings 33.35 are closed off from the exit side opening 36.

Even at the location where the right passage portion 39 is formed, the frontage portion 37 on the exit side
On the other hand, the openings 34 and 35 on the inlet side communicate and disconnect with a phase difference of 180° from the left side. In this way, as the valve body 31 rotates, it communicates with the supercharging port 15)
° With respect to the flow side passage, the upstream supercharging passage 12 and the communication part 2
7 are opened at different times, and the timing valve 26 also serves as communication section opening/closing means. In this case, each opening/closing timing is determined by the size and arrangement δ of each through hole of the passage portion 38, 39.
etc., it is set as requested.

Fig. 3 shows the open areas of ports and valves with the horizontal axis as the rotation angle of the eccentric shaft. Line A is the area between the naturally aspirated ports 14, line B is the open area of the supercharging port 15, and line C is the open area of the ports and valves. is the area between the supercharging passage 25 and the timing valve 26, and the line is the opening 1 rear of the communication portion 27. Note that the dashed-two dotted line C' indicates the area between the supercharging passages in the case of a conventional supercharged engine of this type.

As shown in this figure, the natural intake port 14 is opened for an appropriate period of time to perform natural intake, and the supercharging port 15 is set to be opened almost simultaneously with the natural intake port 14 and closed later than the natural intake port 14. has been done. Further, the opening period of the supercharging passage 12 by the timing valve 26 is set to be a predetermined period from around the end of the opening period of the natural intake port 14 to around the closing time of the supercharging port 15. In contrast,
The communication portion 27 is set to be opened a predetermined rotation angle before the open period of the supercharging port 15 and closed at a predetermined time during the open period of the natural intake port 14 and before the open time of the supercharging passage 12. has been done.

According to the intake control vIl arrangement as described above, after the natural intake port 14 and the supercharging port 15 are opened, the supercharging passage 1 is opened by the timing valve 26 near the end of the natural intake stroke.
When 2 is heard, supercharging air is supplied from the supercharging port 15 to I1 to I6. Then, when the supercharging port 15 and the timing valve 26 are closed thereafter, a relatively high residual pressure is stored in the downstream supercharging passage between the timing valve 26 and the supercharging port 15. .

After this state is reached, the natural intake port 14 and the supercharging port 15 are opened again in the next intake stroke, but the communication portion 27 is heard before this, so that the residual pressure is naturally reduced before the natural intake stroke. The air is released into the intake passage 11. Therefore, blowback of intake air when the natural intake port 14 and supercharging port 15 are opened is suppressed, and naturally intake air is smoothly supplied to the working chamber 6.

Furthermore, since the communication portion 27 is open for a certain period of time after the natural intake port 14 and the supercharging port 15 are connected and before supercharging is performed, in addition to the natural intake port 14, the communication part 27 is also open from the supercharging port 15. , the naturally aspirated air that has passed through the communication portion 27 is sent to the working chamber 6. This increases the naturally aspirated air C and improves the charging efficiency, so in order to achieve a predetermined charging efficiency, less supercharging is required than in the past, and the burden on the supercharger is reduced. In addition, the open period of the supercharging passage 12 (line C in FIG. 3) is shorter than the period in the case of the conventional device (line C' in FIG. 3), and the open period of the natural intake port 14 and the supercharging passage Since the wrap length with the open period of air intake 12 can be made smaller than before, it is also advantageous to prevent air from flowing back into the natural intake passage 11 at the time of starting supercharging.

In the above embodiment, the timing valve 26 also serves as a means for opening and closing the communication portion, but as shown in FIG. A communication part 27' is provided between the supercharging passage 12 and the natural intake passage 11 downstream of the timing valve 26', and a separate part for opening and closing the communication part 27' is provided in the communication part 27'. A timing valve 37 may be provided.

Further, in the above embodiment, the present invention is applied to a rotary piston engine, but when applied to a reciprocating engine, the natural intake port and the supercharging port that open into the combustion chamber are each operated by a valve mechanism. The intake valves for the natural intake port and the supercharging port may be opened and closed, and the rest may be the same as in the above embodiment.

(Effects of the Invention) As described above, the present invention provides a naturally aspirated passageway, a naturally aspirated port leading thereto, a supercharging passageway equipped with a supercharger, a supercharging port leading thereto, and a timing valve in the supercharging passageway. In a partially supercharged engine with Since the residual pressure stored inside the fuel tank is released to the natural intake passage, blowback of intake air at the start of natural intake is suppressed, and filling efficiency can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view showing the structure of the timing valve and the communication part in the supercharging passage, and Fig. 3 is a schematic sectional view showing the structure of the timing valve and the communication part in the supercharging passage. FIG. 4 is an explanatory diagram showing open areas of the supply passage and the communication section, and FIG. 4 is a structural explanatory diagram of the main part showing another embodiment. 10...Intake passage, 11...Natural intake passage, 12.
...Supercharging passage, 13...Supercharger, 14...Natural intake port, 15...Supercharging port, 26...Timing valve (also serves as means for opening and closing the communication part), 27...Communication Department. Patent applicant Mazda Corporation Agent Patent attorney Etsushi Kosho
Patent Attorney Chief 1) Masamukai Patent Attorney Blackboard Kurio Figure 2 Figure 3 Figure r'

Claims (1)

[Claims] 1. A natural intake passage and a supercharging passage equipped with a supercharger are provided in the intake passage of the engine, and a natural intake port communicating with the natural intake passage and a supercharging port communicating with the supercharging passage are connected to the combustion engine of the engine. At the same time, a timing valve is provided in the supercharging passage downstream of the supercharger to open the supercharging passage for a certain period of time from near the end of the natural intake stroke to supply supercharging air from the supercharging port to the combustion chamber. In a supercharged engine, the above-mentioned supercharging port is provided with a communication section that communicates with the naturally-intake passage, and a communication section opening/closing means that opens the communication section for a predetermined engine before the supercharging port opening time. An air intake control device for a supercharged engine featuring: